Discussion on triggering mechanism and time dependence of tidal stress to landslides

LIU Yu-hua; CHEN Zhen-zhou; JIANG Xin

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Discussion on triggering mechanism and time dependence of tidal stress to landslides

更新时间：2026-06-25

- Discussion on triggering mechanism and time dependence of tidal stress to landslides
- Vol. 33, Issue S1, (2012)
- 作者机构：
  
  南京大学地球科学与工程学院,南京,210093
- 作者简介：
- 基金信息：
- DOI：
  CLC： P641
- Online First：21 September 2012，
  
  Published：2012
- 稿件说明：
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LIU Yu-hua, CHEN Zhen-zhou, JIANG Xin. Discussion on triggering mechanism and time dependence of tidal stress to landslides[J]. 2012, 33(S1).
DOI：

LIU Yu-hua, CHEN Zhen-zhou, JIANG Xin. Discussion on triggering mechanism and time dependence of tidal stress to landslides[J]. 2012, 33(S1). DOI：

摘要

已有的滑坡统计数据和研究成果显示，滑坡发生的时间具有明显的周期分布规律特征，除了与降雨季节相关的因素外，受日月引力潮的影响也较明显。从固体潮理论出发，推导简化弹性地球模型地表的潮汐应力表达式，阐述固体潮汐作为滑坡日周期因子对滑坡的影响。在安全系数表达式中考虑潮汐应力的作用，并从表达式中阐述潮汐应力触滑的机制，剖析潮汐应力触发滑坡机制。以1985年的湖北省秭归县新滩特大型滑坡作为算例，采用折线滑动为破坏模式，论述潮汐应力与时间的相关性，以及边坡稳定性安全系数与时间的相关关系。计算结果表明，潮汐应力与边坡安全系数随时间均呈明显日周期及半日周期变动，该边坡稳定性系数的极差与不考虑潮汐应力下的稳定性系数的比值达到3.4%；滑坡发生的时间与潮汐应力处于峰值的时间较为吻合，说明潮汐应力很可能是除降雨等主因之外的触发临界状态滑坡发生的另一因素。

Abstract

The occurrence time of landslides has a significant characteristic with periods distribution

according to landslide statistics and research results nowadays

in addition to rainfall reason

moon gravitational tide was recognized as another apparent reason. The formulas of tidal stress at the surface of earth were derivated by modifying a simplified elastic earth model proceeding from the theory of Earth tide. The formulation of simplified Fellenius method was modified taking the effect of tidal stress into account; then the mechanism of landslide triggered by tidal stress was discussed. The Xintan landslide in Zigui county

Hubei province occurred in 1985 was taken as an example

based on the modified broken lines method

to discuss the correlation between tidal stress and time

and how the safety factor of stability change at the time. The results show that

the tidal stress and the safety factor of slope stability changes with time at daily period; and range of safety factor of this slope could up to 3.4%

according to the calculation. Another conclusion is that the landslide occurs when the value of tidal stress rise to the maximum. It is also shown that the earth tidal stress is another probable triggering factor on landslide which has been in the critical failure condition

besides the rainstorm and other factor.

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